Regular Article
Electrokinetic Properties of Perlite

https://doi.org/10.1006/jcis.1997.4913Get rights and content

Abstract

Electrokinetic properties of expanded and unexpanded perlite samples have been investigated using the microelectrophoresis technique. Perlite samples yield practically no isoelectric point in the pH range of 3 to 11. Both of the perlite samples remain negatively charged in the pH range studied. The expanded perlite has a more negatively charged surface than unexpanded perlite. NaCl, KNO3, NaNO3, Na2CO3, and Na2SO4are indifferent electrolytes for perlite whereas AlCl3and CaCl2change the interface charge from negative to positive. Acid-activation has no significant effect on the zeta potential of perlite.

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    Citation Excerpt :

    Perlite is chemically inert and its surface remains negatively charged in the water of a pH of 7 [29,32] and perlite has no isoelectric point, no point of zero charge pHpzc in the pH range 3–11 as perlite exhibits permanent negative zeta potential values (mV) across that pH range [15,29,33] due to 1) dissociation of the surface hydroxyl groups, and 2) occurrence of crystal lattice changes leading to some alumina-silica interlay in the surface structure [29,32]. Additionally, the zeta potential for expanded perlite in water is higher than the non-expanded [15,34] possibly resulting from increasing broken particle edges during the expansion process [29,33,34]. These characteristics explain the high affinity of the perlite surface to divalent cations (e.g. Cu2+ and Fe2+ in our example) [15]; see further evidence via the supportive characterisation displayed below.

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